Battery for a mobile device



FIG. 1 is a top plan view of an ornamental design of a battery for a mobile device;

FIG. 2 is a side elevational view thereof;

FIG. 3 is an opposite side elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof.

The broken lines shown in FIGS. 1–6 are included for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a battery for a mobile device, as shown and described. 